She doesn't work hard at English,so she fails in the exam.为什么用fails不用failed?

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Shedoesn''tworkhardatEnglish,soshefailsintheexam.为什么用fails不用failed?Shedoesn''tworkhardatEnglish,soshef

She doesn't work hard at English,so she fails in the exam.为什么用fails不用failed?
She doesn't work hard at English,so she fails in the exam.为什么用fails不用failed?

She doesn't work hard at English,so she fails in the exam.为什么用fails不用failed?
因为没有明显的过去,所以句子时态要前后保持一致.这里说的就是一个现在的现象..所以不需要用过去式..